PORTSMOUTH — An additional arrest has been made in connection with the Elizabeth Marriott disappearance and homicide investigation.

Nineteen-year-old Kathryn McDonough, of Portsmouth, was arrested on Dec. 24 and charged with one felony count each of hindering apprehension or prosecution, and conspiracy to commit hindering Apprehension or Prosecution, according to a release issued by the New Hampshire Attorney General Michael A. Delaney, Dover Police Chief Anthony F. Colarusso, Jr. and New Hampshire State Police Colonel, Robert C. Quinn.

Marriott, 19, disappeared on Oct. 9, and her body has not yet been found. Authorities charged Seth Mazzaglia, 29, of Dover, of second-degree murder in connection with Marriott’s death.

Prosecutors say Marriott was either strangled or suffocated in a Mill Street apartment by Mazzaglia and investigators say they have strong leads as to why they searched Peirce Island for her body.